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https://issues.apache.org/jira/browse/CAMEL-16924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen updated CAMEL-16924:
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Fix Version/s: 3.12.0
3.11.2
> After upgrade to Camel 3.11.0. Cannot write to HttpServletResponse when
> aggregator is used.
> -------------------------------------------------------------------------------------------
>
> Key: CAMEL-16924
> URL: https://issues.apache.org/jira/browse/CAMEL-16924
> Project: Camel
> Issue Type: Bug
> Affects Versions: 3.11.1, 3.11.0
> Reporter: Jan Vondrouš
> Priority: Major
> Fix For: 3.11.2, 3.12.0
>
>
> To easily reproduce issue. We have created this mini repo:
> [https://github.com/bugs84/springboot-camel-httpoutput-issue/tree/camel-minimal-sample]
> Description is in README.md
>
> h2. Issue description:
> We are experiencing issue in our project after upgrading Apache Camel from
> version 3.10.0 to 3.11.0 (3.11.1 has the same issue). The same route which
> worked without any problems in previous versions, does not work now. We
> managed to simplify the route from our project and simulate the problem on
> this simplified route.
>
> {code:java}
> String synchronizerEndpoint = "direct:synchronizer";
> String httpOutputEndpoint = "direct:httpOutput";
> // HTTP Input
> from("servlet:///httpIssue?httpMethodRestrict=GET&servletName=CamelServlet")
> .log("Http request received")
> .process(new CorrelationIdGenerator())
> .to(synchronizerEndpoint);
> // Parallel Synchronizer
> from(synchronizerEndpoint)
> .log("Parallel Synchronizer")
> .setHeader("scaler-sync-correlation", correlationExpression)
> .aggregate(correlationExpression, new MyRoutesAggregator())
> .completionSize(1)
> .to(httpOutputEndpoint);
> // HTTP Output
> from(httpOutputEndpoint)
> .log("HTTP Output")
> .process(new ProcessHttpOutput());
> {code}
> n {{ProcessHttpOutput}} processor we are writing the response into the
> OutputStream:
> {code:java}
> private static class ProcessHttpOutput implements Processor {
> @Override
> public void process(Exchange exchange) throws Exception {
> HttpServletResponse response =
> exchange.getMessage().getBody(HttpMessage.class).getResponse();
> response.setStatus(200);
> try (ServletOutputStream outputStream = response.getOutputStream()) {
> outputStream.write(("Response").getBytes(StandardCharsets.UTF_8));
> outputStream.flush();
> }
> }
> }
> {code}
> If we run this route on Camel version 3.11.0. We are getting
> NullPointerException during flushing / closing the stream. It works without
> any problems on 3.10.0.
> The problem is if *aggregation* is in the route (without aggregation it works
> fine). After aggregation, it is not possible to write to the output stream.
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